chore: autoformat bib file

demo/demo.bib

@@ -1,40 +1,40 @@
 @article{Knuth92,
-        author = "D.E. Knuth",
   title         = "Two notes on notation",
+  author        = "D.E. Knuth",
+  year          = "1992",
   journal       = "Amer. Math. Monthly",
   volume        = "99",
-        year = "1992",
-        pages = "403--422",
+  pages         = "403--422"
 }
 
 @book{ConcreteMath,
-        author = "R.L. Graham and D.E. Knuth and O. Patashnik",
   title         = "Concrete mathematics",
+  author        = "R.L. Graham and D.E. Knuth and O. Patashnik",
+  year          = "1989",
   publisher     = "Addison-Wesley",
-        address = "Reading, MA",
-        year = "1989"
+  address       = "Reading, MA"
 }
 
 @unpublished{Simpson,
-        author = "H. Simpson",
   title         = "Proof of the {R}iemann {H}ypothesis",
-        note = "preprint (2003), available at
-        \texttt{http://www.math.drofnats.edu/riemann.ps}",
-        year = "2003"
+  author        = "H. Simpson",
+  year          = "2003",
+  note          = "preprint (2003), available at \texttt{http://www.math.drofnats.edu/riemann.ps}"
 }
 
 @incollection{Er01,
-        author = "P. Erd{\H o}s",
   title         = "A selection of problems and results in combinatorics",
+  author        = "P. Erd{\H o}s",
+  year          = "1995",
   booktitle     = "Recent trends in combinatorics (Matrahaza, 1995)",
   publisher     = "Cambridge Univ. Press",
   address       = "Cambridge",
-        pages = "1--6",
-        year = "1995"
+  pages         = "1--6"
 }
+
 @article{greenwade93,
-    author  = "George D. Greenwade",
   title         = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",
+  author        = "George D. Greenwade",
   year          = "1993",
   journal       = "TUGBoat",
   volume        = "14",